Commit 8a2f4c91 authored by Michael Natterer's avatar Michael Natterer 😴

plug-ins: port file-png-save to begin_export()/end_export()

which removes quite some boilerplate. Also remove the boolean
"profile_saved" return value of save_image() and instead modify the
config. Add a "bits_per_sample" return value and set value on the
metadata instead of always "8".
parent 8219092a
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